US20090158806A1 - Method For Bending Tubular Articles With A Relative Ratio Of The Bending Radius And The Outer Diameter Of The Finished Pipe Which Is Less Than 3 - Google Patents
Method For Bending Tubular Articles With A Relative Ratio Of The Bending Radius And The Outer Diameter Of The Finished Pipe Which Is Less Than 3 Download PDFInfo
- Publication number
- US20090158806A1 US20090158806A1 US12/336,790 US33679008A US2009158806A1 US 20090158806 A1 US20090158806 A1 US 20090158806A1 US 33679008 A US33679008 A US 33679008A US 2009158806 A1 US2009158806 A1 US 2009158806A1
- Authority
- US
- United States
- Prior art keywords
- article
- die
- bending
- boss
- die half
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
- B21D7/162—Heating equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/08—Bending tubes using mandrels or the like in press brakes or between rams and anvils or abutments; Pliers with forming dies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49805—Shaping by direct application of fluent pressure
Definitions
- the present invention relates to a method and a die for bending tubular elements.
- this piping must have connecting branches extending in transverse—i.e. usually radial—directions and, particularly in the case of piping used for high-risk applications, such as nuclear power stations, these branches should not be welded to the respective pipe section after bending, but must be formed integrally therewith during forging of the pipe so as to ensure continuity of the piping and therefore avoid the risk of leakages of dangerous material.
- the technical problem which is posed, therefore, is to provide a method and an associated die for bending pipes for piping having relative ratios R/D of the bending radius R and the outer diameter D of the pipe with values less than 3.
- the die and method should be able to allow bending with the necessary tolerances also in the case where radial branches integral with the pipe are present during bending.
- FIG. 1 shows a side view of a pipe with radial branches, inserted inside a die according to the present invention
- FIG. 2 shows a front view of the assembly according to FIG. 1 ;
- FIG. 3 shows a schematic cross-section along the plane indicated by III-III in FIG. 2 ;
- FIG. 4 shows a side view of the assembly according to FIG. 1 during the first bending stage
- FIG. 5 shows a front view of the assembly according to FIG. 4 ;
- FIG. 6 shows a schematic view along the plane indicated by VI-VI in FIG. 5 ;
- FIG. 7 shows a perspective view of the assembly according to FIG. 1 during the final bending stage
- FIG. 8 shows a front view of the assembly according to FIG. 7 ;
- FIG. 9 shows a cross-section along the plane indicated by IX-IX in FIG. 8 ;
- FIG. 10 shows a side view of the assembly according to FIG. 7 in the direction of the arrow X shown in FIG. 8 ;
- FIG. 11 shows a side view of the assembly according to FIG. 7 in the direction of the arrow XI shown in FIG. 8 ;
- FIGS. 12 a - 12 d shows schematic cross-sections along vertical planes of the pipe branch finishing stages
- FIGS. 13-14 show side views of a practical example of application of the method according to the present invention.
- a set of three reference axes in a longitudinal direction X-X, transverse direction Y-Y and vertical direction Z-Z, respectively, the pipe 1 a to be bent extends in the longitudinal direction X-X and has an outer diameter D.
- the straight article 1 a used as the basic part for the method according to the present invention is obtained by forging a bloom of the material required and will have a form (produced at the steelworks), diameters, thicknesses and lengths which are suitable for obtaining the finished part with the required dimensions after forming/forging according to the present invention.
- the forged straight article (such as a forged pipe) 1 a also has bosses 2 a of material which project radially in specific zones and from which, using the methods described below, the integral branches 2 projecting radially from the surface of the finished pipe 1 will be obtained.
- the forged straight article 1 a is inserted inside an asymmetrical vertical die 100 formed by a bottom die half 110 and a top die half 120 ;
- the bottom die half ( FIG. 3 ) has a seat 111 for the finished pipe 1 , comprising a first straight section 111 a , forming a first angle ⁇ with the horizontal base surface, and a second straight section 111 b , forming an angle ⁇ with respect to the same base surface; the two straight sections are connected continuously by a suitable joining piece 111 c.
- the inner part of the curved top die half 120 has a form corresponding to the half curve which extends from the neutral axes N 1 as far as the intrados I 1 ( FIG. 9 ) of the bent pipe 1 .
- bosses 2 a of material for forming the branches 2 are present, and said bosses 2 a are arranged in the zones adjacent to the section to be bent, it is not possible to use a symmetrical bending process according to the conventional technique and maintain an active and reactive force along the same axis in the press, and it is instead necessary to perform asymmetrical bending.
- the top die half 120 has inside it a seat 122 suitably formed in the top die half 120 with dimensions corresponding to the dimensions of the boss 2 a and a punch 121 asymmetrically arranged in the longitudinal direction X-X with respect to the vertical centre axis of the die so as to cause initial contact between the top die 120 and the forged straight article 1 a , along a section adjacent to the base 2 b of the boss 2 a and cause initial bending of the curve in the vicinity of the latter.
- bending may be performed in a single step it is preferable to perform the final bending in several stages—preferably two or three stages—alternating with intermediate heating stages for restoring the initial forging temperature.
- the die have a round cross-section it is possible to obtain a curved article already sized with a round cross-section; in practice it is preferred, however, to provide slight ovalization of the bending die so as to allow a subsequent sizing step by means of which more precise tolerances may be determined; in this case the oval form of the die will be such that the larger axis is perpendicular to the plane which contains the axis of the article bent by means of the bending operation;
- bosses 2 a are present, as shown, should they have a length in the transverse direction Y-Y (radial direction) less than the required length for the final branch 2 , further steps are required in the method as described below with reference to FIGS. 12 a to 12 d:
Abstract
Description
- The present invention relates to a method and a die for bending tubular elements.
- It is known in the technical sector relating to the manufacture of large-size tubular piping which is normally made by means of forging that there exists the need to obtain curved sections by means of bending of the pipe.
- Although the bending methods performed for example using bending machines are per se conventional, these methods however are not suitable in the particular case where it is required to bend pipes which have relative ratios of the bending radius R and the outer diameter D of the pipe with values less than 3.
- It is also known that this piping must have connecting branches extending in transverse—i.e. usually radial—directions and, particularly in the case of piping used for high-risk applications, such as nuclear power stations, these branches should not be welded to the respective pipe section after bending, but must be formed integrally therewith during forging of the pipe so as to ensure continuity of the piping and therefore avoid the risk of leakages of dangerous material.
- The presence of these transverse branch extensions integral with the pipe means, however, that conventional bending machines cannot be used and in particular makes it difficult to perform bending of the pipe with the degree of precision required by the specific applications, the bending not being able to performed using normal known methods particularly in the case where the base of one or more of these branches is adjacent to the initial section of curvature of a curved section, making it particularly difficult to perform both forging of the article and subsequent bending.
- The technical problem which is posed, therefore, is to provide a method and an associated die for bending pipes for piping having relative ratios R/D of the bending radius R and the outer diameter D of the pipe with values less than 3.
- In connection with this problem it is also desirable that the die and method should be able to allow bending with the necessary tolerances also in the case where radial branches integral with the pipe are present during bending.
- These results can be achieved according to the present invention by a method according to the characteristic features and a die according to the characteristic features provided in the description and the claims.
- Further details may be obtained from the following description of a non-limiting example of embodiment of the subject of the present invention provided with reference to the accompanying drawings in which:
-
FIG. 1 shows a side view of a pipe with radial branches, inserted inside a die according to the present invention; -
FIG. 2 shows a front view of the assembly according toFIG. 1 ; -
FIG. 3 shows a schematic cross-section along the plane indicated by III-III inFIG. 2 ; -
FIG. 4 shows a side view of the assembly according toFIG. 1 during the first bending stage; -
FIG. 5 shows a front view of the assembly according toFIG. 4 ; -
FIG. 6 shows a schematic view along the plane indicated by VI-VI inFIG. 5 ; -
FIG. 7 shows a perspective view of the assembly according toFIG. 1 during the final bending stage; -
FIG. 8 shows a front view of the assembly according toFIG. 7 ; -
FIG. 9 shows a cross-section along the plane indicated by IX-IX inFIG. 8 ; -
FIG. 10 shows a side view of the assembly according toFIG. 7 in the direction of the arrow X shown inFIG. 8 ; -
FIG. 11 shows a side view of the assembly according toFIG. 7 in the direction of the arrow XI shown inFIG. 8 ; -
FIGS. 12 a-12 d shows schematic cross-sections along vertical planes of the pipe branch finishing stages; and -
FIGS. 13-14 show side views of a practical example of application of the method according to the present invention. - As shown in
FIG. 1 and assuming for the sole sake of convenience of description and without limiting the description, a set of three reference axes in a longitudinal direction X-X, transverse direction Y-Y and vertical direction Z-Z, respectively, thepipe 1 a to be bent extends in the longitudinal direction X-X and has an outer diameter D. - The
straight article 1 a used as the basic part for the method according to the present invention is obtained by forging a bloom of the material required and will have a form (produced at the steelworks), diameters, thicknesses and lengths which are suitable for obtaining the finished part with the required dimensions after forming/forging according to the present invention. - The forged straight article (such as a forged pipe) 1 a also has
bosses 2 a of material which project radially in specific zones and from which, using the methods described below, the integral branches 2 projecting radially from the surface of the finishedpipe 1 will be obtained. - The forged
straight article 1 a is inserted inside an asymmetricalvertical die 100 formed by abottom die half 110 and atop die half 120; the bottom die half (FIG. 3 ) has aseat 111 for the finishedpipe 1, comprising a firststraight section 111 a, forming a first angle α with the horizontal base surface, and a second straight section 111 b, forming an angle β with respect to the same base surface; the two straight sections are connected continuously by a suitable joiningpiece 111 c. - The inner part of the curved
top die half 120 has a form corresponding to the half curve which extends from the neutral axes N1 as far as the intrados I1 (FIG. 9 ) of thebent pipe 1. - If, as in the case shown,
bosses 2 a of material for forming the branches 2 are present, and saidbosses 2 a are arranged in the zones adjacent to the section to be bent, it is not possible to use a symmetrical bending process according to the conventional technique and maintain an active and reactive force along the same axis in the press, and it is instead necessary to perform asymmetrical bending. - For this purpose the
top die half 120 has inside it aseat 122 suitably formed in thetop die half 120 with dimensions corresponding to the dimensions of theboss 2 a and apunch 121 asymmetrically arranged in the longitudinal direction X-X with respect to the vertical centre axis of the die so as to cause initial contact between thetop die 120 and the forgedstraight article 1 a, along a section adjacent to the base 2 b of theboss 2 a and cause initial bending of the curve in the vicinity of the latter. - Using the die described above it is possible to implement a method for bending tubular elements, comprising the following steps:
-
- preparing a straight article (such as, a forged pipe) 1 a made of material with a predefined composition depending on the final use and with a predefined length L in the longitudinal direction and outer diameter D;
- said pipe may have at least one
boss 2 a with base 2 b extending radially outwards; - preparing a die (100) comprising:
- an asymmetrical bottom die
half 110 withseat 111 for thearticle 1 a; - a
top die half 120 withpunch 121 asymmetrically arranged in the longitudinal direction X-X with respect to the vertical centre axis of the die; - and an
optional seat 122 for receiving theboss 2 a, if present; - heating in an oven to the required temperature for forging depending on the specific composition of the material;
- ovalization of the longitudinal pipe section Lp corresponding to the section for bending by means of the press;
- positioning the
straight article 1 a inside thebottom die half 110 in the longitudinal direction X-X so that the base 2 b of theboss 2 a is substantially aligned in the vertical direction Z-Z with the head of theupper punch 121; - bending of the
article 1 a by means of closing of the two die halves.
- Although bending may be performed in a single step it is preferable to perform the final bending in several stages—preferably two or three stages—alternating with intermediate heating stages for restoring the initial forging temperature.
- Should the die have a round cross-section it is possible to obtain a curved article already sized with a round cross-section; in practice it is preferred, however, to provide slight ovalization of the bending die so as to allow a subsequent sizing step by means of which more precise tolerances may be determined; in this case the oval form of the die will be such that the larger axis is perpendicular to the plane which contains the axis of the article bent by means of the bending operation;
-
- machine-tool machining of the bent and cooled part so as to perform the finishing thereof to the final dimensions.
- Should the bosses have a length sufficient for the purpose, it is possible to perform rough-machining, heat treatment and surface-finishing.
- Where
bosses 2 a are present, as shown, should they have a length in the transverse direction Y-Y (radial direction) less than the required length for the final branch 2, further steps are required in the method as described below with reference toFIGS. 12 a to 12 d: -
- boring the
boss 2 a in the radial direction; - localized heating of the zone to be deformed, up to the temperature necessary for plastic deformation;
- multi-step extrusion by means of successive through-forcing of drift plugs 200 of increasing diameter until the external surface of the
boss 2 a makes contact with the internal surface of a suitably formedseat 315 in anexternal die 300; - drawing the material by means of through-forcing of drift plugs with a diameter greater than the internal diameter of the branch, the thickness of which is reduced and the length of which increased to the design dimension;
- heat treatment required for use of the finished pipe;
- machine-finishing;
- surface finishing treatment (pickling, passivation and the like).
- boring the
- The accompanying drawings illustrate, purely by example, bending of a part performed during trial tests (
FIGS. 13 and 14 ) on a pipe sample with a diameter D=515 mm and length L11=2,848 mm which had a first boss with a height h11 asymmetrically arranged at distances L21=1171.6 e L31=1676.3 from the opposite ends of the pipe. - Said bosses had a height h11=h21=200.8 mm, diameter of the base Db=377.8 and interaxial distance L21=1014.5 mm (
FIG. 13 ). - The pipe made of material 316L was treated with heating performed at T=950° C.
- The finished and bent pipe had a length L1=2640 mm, a first straight section with a length L21=1014.5 mm, a second straight section L3=460 mm, connected together by a joining piece with a radius of curvature R=735.08 mm about 1.5 times the outer diameter D of the pipe and bending angle=56°; the outer diameter D, after sizing, was between 497 and 502 mm, a first boss arranged in position L21=1171.6 mm and a second boss arranged at a distance l21=620 mm from the first boss; both bosses had a diameter of the base Db=377 mm and height h=205 mm.
- It is therefore clear how with the die and the method according to the invention it is possible to bend pipes using an industrial method which is repetitive and reliable also in the case of a relative ratio of the bending radius R and the outer diameter D of the pipe which is less than 3 and also form transverse branches integral with the pipe from radial bosses integral with the manufactured pipe at the time of bending.
- The same method is also applicable in the particularly complex case of bending being started in a zone very close to the base of the branch, which case has not been solved by the prior art.
Claims (12)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2007A002372 | 2007-12-19 | ||
ITMI07A02372 | 2007-12-19 | ||
IT002372A ITMI20072372A1 (en) | 2007-12-19 | 2007-12-19 | PROCEDURE FOR BENDING TUBULAR ARTICLES WITH A REPORT> 3 BETWEEN THE BENDING RADIUS AND THE EXWERN DIAMETER OF THE FINISHED TUBE |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090158806A1 true US20090158806A1 (en) | 2009-06-25 |
US8037726B2 US8037726B2 (en) | 2011-10-18 |
Family
ID=40315607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/336,790 Active 2030-03-14 US8037726B2 (en) | 2007-12-19 | 2008-12-17 | Method for bending tubular articles with a relative ratio of the bending radius and the outer diameter of the finished pipe which is less than 3 |
Country Status (7)
Country | Link |
---|---|
US (1) | US8037726B2 (en) |
EP (1) | EP2072158B1 (en) |
KR (1) | KR20090067050A (en) |
CN (1) | CN101462130B (en) |
AT (1) | ATE481189T1 (en) |
DE (1) | DE602008002535D1 (en) |
IT (1) | ITMI20072372A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130047416A1 (en) * | 2011-08-22 | 2013-02-28 | Wei-Ming Sim | Method of manufacturing an elongate component |
CN106311836A (en) * | 2016-08-31 | 2017-01-11 | 北京星航机电装备有限公司 | Forming method and device for large-pipe-diameter thin-wall pipeline moving towards complex space |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101829716B (en) * | 2010-05-04 | 2011-07-27 | 吉林省昊宇石化电力设备制造有限公司 | Method for pressing nuclear power main pipeline |
JP5431251B2 (en) * | 2010-06-10 | 2014-03-05 | 株式会社神戸製鋼所 | Bending mold, automobile suspension arm manufacturing apparatus using the same, and manufacturing method thereof |
CN102641958A (en) * | 2012-05-04 | 2012-08-22 | 太仓市弧螺机电有限公司 | Stretch bending device |
CN102756011B (en) * | 2012-07-10 | 2015-02-18 | 清华大学 | Manufacture method of irregular pipe |
CN103658274A (en) * | 2012-09-11 | 2014-03-26 | 北京首宏钢重型装备技术有限公司 | Pipe fitting forming device |
CN103672272A (en) * | 2012-09-11 | 2014-03-26 | 北京首宏钢重型装备技术有限公司 | Pipe blank |
CN116197273A (en) * | 2023-02-01 | 2023-06-02 | 徐州桂丰金属科技有限公司 | Aluminum alloy processing device |
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US1962510A (en) * | 1931-09-11 | 1934-06-12 | Taylor Forge & Pipe Works | Method of and apparatus for forming tubular bends |
US2466877A (en) * | 1943-11-08 | 1949-04-12 | W C Norris | Method of and means for bending pipe |
US3934450A (en) * | 1974-08-12 | 1976-01-27 | General Steel Industries, Inc. | Method and apparatus for bending elongated members |
US4596128A (en) * | 1984-07-26 | 1986-06-24 | Cojafex Bv | Method and apparatus for bending elongate workpieces, particularly pipes |
US4841760A (en) * | 1986-08-13 | 1989-06-27 | Ferguson James M | Process and apparatus for manufacturing tube bends |
US4854150A (en) * | 1986-12-19 | 1989-08-08 | Rockwell International Suspension Systems Company | Method of bending and forming heated tubular workpieces |
US5974854A (en) * | 1997-09-10 | 1999-11-02 | Tseng; Shao-Chien | Apparatus for bending forging artistic metallic pipes |
US7140225B2 (en) * | 2004-02-09 | 2006-11-28 | Yutaka Giken Co., Ltd. | Method of bending pipe and apparatus therefor |
US7464572B2 (en) * | 2001-10-24 | 2008-12-16 | Honda Giken Kogyo Kabushiki Kaisha | Process for forming tubular member |
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JPS5747530A (en) * | 1980-09-05 | 1982-03-18 | Kouban Press Kogyo Kk | Manufacture of bent pipe |
JPS58928B2 (en) * | 1981-03-17 | 1983-01-08 | 厚板プレス工業株式会社 | Method for manufacturing bent pipes |
DE3247200A1 (en) * | 1982-12-21 | 1984-07-05 | Emil Wolff, Maschinenfabrik Und Eisengiesserei Gmbh, 4300 Essen | Process and bending press for the bending of a straight pipe to form a pipe bend with connected straight legs |
JPS61164626A (en) | 1985-01-17 | 1986-07-25 | Jgc Corp | Method for performing judgment of reuse possibility of adsorptive desulfurization agent |
JPS6254526A (en) * | 1985-09-03 | 1987-03-10 | Honda Motor Co Ltd | Hot bend forming metal die |
-
2007
- 2007-12-19 IT IT002372A patent/ITMI20072372A1/en unknown
-
2008
- 2008-12-02 AT AT08170447T patent/ATE481189T1/en not_active IP Right Cessation
- 2008-12-02 EP EP08170447A patent/EP2072158B1/en active Active
- 2008-12-02 DE DE602008002535T patent/DE602008002535D1/en active Active
- 2008-12-11 KR KR1020080125848A patent/KR20090067050A/en not_active Application Discontinuation
- 2008-12-17 US US12/336,790 patent/US8037726B2/en active Active
- 2008-12-18 CN CN2008101852126A patent/CN101462130B/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US1962510A (en) * | 1931-09-11 | 1934-06-12 | Taylor Forge & Pipe Works | Method of and apparatus for forming tubular bends |
US2466877A (en) * | 1943-11-08 | 1949-04-12 | W C Norris | Method of and means for bending pipe |
US3934450A (en) * | 1974-08-12 | 1976-01-27 | General Steel Industries, Inc. | Method and apparatus for bending elongated members |
US4596128A (en) * | 1984-07-26 | 1986-06-24 | Cojafex Bv | Method and apparatus for bending elongate workpieces, particularly pipes |
US4841760A (en) * | 1986-08-13 | 1989-06-27 | Ferguson James M | Process and apparatus for manufacturing tube bends |
US4854150A (en) * | 1986-12-19 | 1989-08-08 | Rockwell International Suspension Systems Company | Method of bending and forming heated tubular workpieces |
US5974854A (en) * | 1997-09-10 | 1999-11-02 | Tseng; Shao-Chien | Apparatus for bending forging artistic metallic pipes |
US7464572B2 (en) * | 2001-10-24 | 2008-12-16 | Honda Giken Kogyo Kabushiki Kaisha | Process for forming tubular member |
US7140225B2 (en) * | 2004-02-09 | 2006-11-28 | Yutaka Giken Co., Ltd. | Method of bending pipe and apparatus therefor |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130047416A1 (en) * | 2011-08-22 | 2013-02-28 | Wei-Ming Sim | Method of manufacturing an elongate component |
US9201417B2 (en) * | 2011-08-22 | 2015-12-01 | Airbus Operations Limited | Method of manufacturing an elongate component |
CN106311836A (en) * | 2016-08-31 | 2017-01-11 | 北京星航机电装备有限公司 | Forming method and device for large-pipe-diameter thin-wall pipeline moving towards complex space |
Also Published As
Publication number | Publication date |
---|---|
EP2072158B1 (en) | 2010-09-15 |
ITMI20072372A1 (en) | 2009-06-20 |
CN101462130B (en) | 2011-01-05 |
ATE481189T1 (en) | 2010-10-15 |
CN101462130A (en) | 2009-06-24 |
DE602008002535D1 (en) | 2010-10-28 |
US8037726B2 (en) | 2011-10-18 |
EP2072158A1 (en) | 2009-06-24 |
KR20090067050A (en) | 2009-06-24 |
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